<script lang="tsx">
  import { Modal } from 'ant-design-vue';
  import { defineComponent, watch } from 'compatible-vue';
  import { ModalProps } from './types';
  import { modalProps } from './props';
  export default defineComponent({
    name: 'Modal',
    extends: Modal,
    props: modalProps,
    setup(props: ModalProps) {
      const getStyle = (dom, attr) => {
        return getComputedStyle(dom)[attr];
      };
      const drag = (wrap) => {
        if (!wrap) return;
        wrap.setAttribute('data-drag', props.draggable);
        const dialogHeaderEl = wrap.querySelector('.ant-modal-header');
        const dragDom = wrap.querySelector('.ant-modal');

        if (!dialogHeaderEl || !dragDom || !props.draggable) return;

        dialogHeaderEl.style.cursor = 'move';

        dialogHeaderEl.onmousedown = (e) => {
          // 鼠标按下，计算当前元素距离可视区的距离
          const disX = e.clientX;
          const disY = e.clientY;
          const screenWidth = document.body.clientWidth; // body当前宽度
          const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)

          const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
          const dragDomheight = dragDom.offsetHeight; // 对话框高度

          const minDragDomLeft = dragDom.offsetLeft;

          const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
          const minDragDomTop = dragDom.offsetTop;
          const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
          // 获取到的值带px 正则匹配替换
          const domLeft = getStyle(dragDom, 'left');
          const domTop = getStyle(dragDom, 'top');
          let styL = +domLeft;
          let styT = +domTop;

          // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
          if (domLeft.includes('%')) {
            styL = +document.body.clientWidth * (+domLeft.replace(/%/g, '') / 100);
            styT = +document.body.clientHeight * (+domTop.replace(/%/g, '') / 100);
          } else {
            styL = +domLeft.replace(/px/g, '');
            styT = +domTop.replace(/px/g, '');
          }

          document.onmousemove = function (e) {
            // 通过事件委托，计算移动的距离
            let left = e.clientX - disX;
            let top = e.clientY - disY;

            // 边界处理
            if (-left > minDragDomLeft) {
              left = -minDragDomLeft;
            } else if (left > maxDragDomLeft) {
              left = maxDragDomLeft;
            }

            if (-top > minDragDomTop) {
              top = -minDragDomTop;
            } else if (top > maxDragDomTop) {
              top = maxDragDomTop;
            }

            // 移动当前元素
            dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
          };

          document.onmouseup = () => {
            document.onmousemove = null;
            document.onmouseup = null;
          };
        };
      };
      const handleDrag = () => {
        const dragWraps = document.querySelectorAll('.ant-modal-wrap');
        for (const wrap of dragWraps as any) {
          const display = getStyle(wrap, 'display');
          const draggable = wrap.getAttribute('data-drag');
          if (display !== 'none') {
            // 拖拽位置
            draggable === null && drag(wrap);
          }
        }
      };

      watch(
        () => props.visible,
        (visible) => {
          if (!visible) {
            return;
          }
          // context.$nextTick();
          setTimeout(() => {
            handleDrag();
          }, 30);
        },
        {
          immediate: true,
        }
      );
      return {};
    },
  });
</script>
